Administration of the MapR Database is done primarily via the command line (maprcli) or with the MapR Control System (MCS). Regardless of whether the MapR Database table is used for binary files or JSON documents, the same types of commands are used with slightly different parameter
options. MapR Database administration is associated with tables, columns and column families, and table regions.

The MapR Data Access Gateway is a service that acts as a proxy and gateway for translating requests between lightweight
client applications and the MapR cluster. This section describes considerations when upgrading the service, how to modify
configuration settings, and how to administer and manage the service.

Transitioning a Standby ResourceManager to Active

The yarn rmadmin command includes options to manage high availability
for the ResourceManager, including transitioning a ResourceManager node between active and
standby modes. These commands take the ResourceManager service ID as an argument and can be
run on any node in the cluster. The serviceID of a ResourceManager is set in the
yarn.resourcemanager.ha.rm-ids property of the yarn-site.xml
file.

Transition a standby ResourceManager to the active state when the active
ResourceManager process has failed or the node that runs the process is no longer
accessible.